<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>v-for</title>
  <script src="../assets/js/vue.js"></script>
</head>

<body>
  <h1>v-for</h1>
  <hr>
  <div id="app">
    <ul>
      <li v-for="item in sortItems">
        {{item}}
      </li>
    </ul>
    <hr>
    <ul>
      <li v-for="(student,index) in sortStudents">
        {{index+1}}:{{student.name}}--{{student.age}}
      </li>
    </ul>
  </div>
  <script type="text/javascript">
    var app = new Vue({
      el: '#app',
      data: {
        items: [53, 23, 7, 14, 54, 36, 28],
        students: [{
            name: 'Zhangsan',
            age: 33
          },
          {
            name: 'Zhangsan2',
            age: 32
          },
          {
            name: 'Zhangsan3',
            age: 31
          },
          {
            name: 'Zhangsan4',
            age: 30
          },
        ]
      },
      computed: {
        sortItems: function () {
          return this.items.sort(sortNumber);
        },
        sortStudents: function () {
          return sortByKey(this.students, 'age')
        }
      }
    });

    function sortNumber(a, b) {
      return a - b;
    }
    //数组对象方法排序:
    function sortByKey(array, key) {
      return array.sort(function (a, b) {
        var x = a[key];
        var y = b[key];
        return ((x < y) ? -1 : ((x > y) ? 1 : 0));
      });
    }
  </script>
</body>

</html>